Ghost arc with 300mm f/4D ED-IF
Since last November I saw every shots with this lens has a ghost arc at the bottom, a little to the left from the middle. If the back ground is white the arc is very visible. Here is 1:1 crop from a 4288x2848 shot. I opened the front and end cap and can't see anything there. I still think it's probably a dust over somewhere. Since this lens has instruction no not to blowing with dust blower I can't do anything. I bought from gray market nearly 3 years ago and nobody except me is responsible. So what's it and how can I get rid of it.
Looks like dust on your sensor. Telephotos tend to accentuate visibility of dust. Take a look at your sensor.
It can't be on camera. I used 55-200mm VR and 135mm f2 and a few other short lenses though all of them are considerably shorter than 300mm. And the ghost arc only appears when I use the 300mm Lens and photos with other lenses are very clean at that position. My camera is D300 and I had cleaned the sensor often.
What I did was "Clean image sensor" on the setup menu. I did it intentionally and I also set it to clean at startup and shutdown. So it's done pretty often. Beyond this is there more means to clean that? If so how can I do that myself? Thanks.
Since you don't see this with two other lenses, there may be something in the lens, in the back group of elements. Something in the front elements of the 300mm ED-IF should be far enough out of focus that it won't be a problem. Either way, the problems are usually noticed at smaller apertures such as f/11-16 and when shooting against a bright background, where it is in effect a shadow. If this is something on your sensor, camera auto-sensor clean is probably better than nothing, but not that much better. Aloha.
What I did was "Clean image sensor" on the setup menu.
I did it intentionally and I also set it to clean at startup and shutdown. So it's done pretty often.
I don't mean this internal Camera Cleaning function.
It is the same if You would shaking a full vacuum cleaner Bag.
Beyond this is there more means to clean that?
If so how can I do that myself? Thanks.
I use it to inspect my sensor but also to inspect and clean my lenses. It's a great investment.
Have a local repair facility give the lens a quick check, they probably won't charge you. Aloha.
Yes, shoot with your other lens even down to f22 and see if there is anything showing. If not then its the 300 .... get the lens checked out.